Removes that test support with comma-separated strings

detekt-rules-style/src/test/kotlin/io/gitlab/arturbosch/detekt/rules/style/ForbiddenMethodCallSpec.kt

@@ -40,11 +40,9 @@ class ForbiddenMethodCallSpec(val env: KotlinCoreEnvironment) {
             System.out.println("hello")
         }
         """
-        val findings =
-            ForbiddenMethodCall(TestConfig(mapOf(METHODS to "  "))).compileAndLintWithContext(
-                env,
-                code
-            )
+        val findings = ForbiddenMethodCall(
+            TestConfig(mapOf(METHODS to listOf("  ")))
+        ).compileAndLintWithContext(env, code)
         assertThat(findings).isEmpty()
     }
 
@@ -114,22 +112,6 @@ class ForbiddenMethodCallSpec(val env: KotlinCoreEnvironment) {
         assertThat(findings).hasTextLocations(48 to 64, 76 to 80)
     }
 
-    @Test
-    fun `should report multiple different methods config with sting`() {
-        val code = """
-        import java.lang.System
-        fun main() {
-        System.out.println("hello")
-            System.gc()
-        }
-        """
-        val findings = ForbiddenMethodCall(
-            TestConfig(mapOf(METHODS to "java.io.PrintStream.println, java.lang.System.gc"))
-        ).compileAndLintWithContext(env, code)
-        assertThat(findings).hasSize(2)
-        assertThat(findings).hasTextLocations(48 to 64, 76 to 80)
-    }
-
     @Test
     fun `should report equals operator`() {
         val code = """